Re: [PATCH 1/2] iommu/arm-smmu-qcom: Skip the TTBR1 quirk for db820c.

On Mon, Mar 29, 2021 at 7:47 AM Will Deacon [off-list ref] wrote:

On Fri, Mar 26, 2021 at 04:13:02PM -0700, Eric Anholt wrote:

quoted

db820c wants to use the qcom smmu path to get HUPCF set (which keeps
the GPU from wedging and then sometimes wedging the kernel after a
page fault), but it doesn't have separate pagetables support yet in
drm/msm so we can't go all the way to the TTBR1 path.

What do you mean by "doesn't have separate pagetables support yet"? The
compatible string doesn't feel like the right way to determine this.

the compatible string identifies what it is, not what the sw
limitations are, so in that regard it seems right to me..

BR,
-R